/*
 * (C) Copyright 2005- ECMWF.
 *
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
 *
 * In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
 * virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
 */

/**********************************
 *  Enrico Fucile
 *********************************/

#include "grib_api_internal.h"
/*
   This is used by make_class.pl

   START_CLASS_DEF
   CLASS      = accessor
   SUPER      = grib_accessor_class_long
   IMPLEMENTS = unpack_long; pack_long
   IMPLEMENTS = init
   MEMBERS = const char* values
   MEMBERS = const char* bits_per_value
   MEMBERS = const char* changing_precision
   MEMBERS = const char* decimal_scale_factor
   END_CLASS_DEF
 */

/* START_CLASS_IMP */

/*

Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
Instead edit values between START_CLASS_DEF and END_CLASS_DEF
or edit "accessor.class" and rerun ./make_class.pl

*/

static int pack_long(grib_accessor*, const long* val, size_t* len);
static int unpack_long(grib_accessor*, long* val, size_t* len);
static void init(grib_accessor*, const long, grib_arguments*);
static void init_class(grib_accessor_class*);

typedef struct grib_accessor_decimal_precision
{
    grib_accessor att;
    /* Members defined in gen */
    /* Members defined in long */
    /* Members defined in decimal_precision */
    const char* values;
    const char* bits_per_value;
    const char* changing_precision;
    const char* decimal_scale_factor;
} grib_accessor_decimal_precision;

extern grib_accessor_class* grib_accessor_class_long;

static grib_accessor_class _grib_accessor_class_decimal_precision = {
    &grib_accessor_class_long,               /* super                     */
    "decimal_precision",                     /* name                      */
    sizeof(grib_accessor_decimal_precision), /* size                      */
    0,                                       /* inited */
    &init_class,                             /* init_class */
    &init,                                   /* init                      */
    0,                                       /* post_init                      */
    0,                                       /* free mem                       */
    0,                                       /* describes himself         */
    0,                                       /* get length of section     */
    0,                                       /* get length of string      */
    0,                                       /* get number of values      */
    0,                                       /* get number of bytes      */
    0,                                       /* get offset to bytes           */
    0,                                       /* get native type               */
    0,                                       /* get sub_section                */
    0,                                       /* grib_pack procedures long      */
    0,                                       /* grib_pack procedures long      */
    &pack_long,                              /* grib_pack procedures long      */
    &unpack_long,                            /* grib_unpack procedures long    */
    0,                                       /* grib_pack procedures double    */
    0,                                       /* grib_unpack procedures double  */
    0,                                       /* grib_pack procedures string    */
    0,                                       /* grib_unpack procedures string  */
    0,                                       /* grib_pack array procedures string    */
    0,                                       /* grib_unpack array procedures string  */
    0,                                       /* grib_pack procedures bytes     */
    0,                                       /* grib_unpack procedures bytes   */
    0,                                       /* pack_expression */
    0,                                       /* notify_change   */
    0,                                       /* update_size   */
    0,                                       /* preferred_size   */
    0,                                       /* resize   */
    0,                                       /* nearest_smaller_value */
    0,                                       /* next accessor    */
    0,                                       /* compare vs. another accessor   */
    0,                                       /* unpack only ith value          */
    0,                                       /* unpack a subarray         */
    0,                                       /* clear          */
    0,                                       /* clone accessor          */
};


grib_accessor_class* grib_accessor_class_decimal_precision = &_grib_accessor_class_decimal_precision;


static void init_class(grib_accessor_class* c)
{
    c->dump                   = (*(c->super))->dump;
    c->next_offset            = (*(c->super))->next_offset;
    c->string_length          = (*(c->super))->string_length;
    c->value_count            = (*(c->super))->value_count;
    c->byte_count             = (*(c->super))->byte_count;
    c->byte_offset            = (*(c->super))->byte_offset;
    c->get_native_type        = (*(c->super))->get_native_type;
    c->sub_section            = (*(c->super))->sub_section;
    c->pack_missing           = (*(c->super))->pack_missing;
    c->is_missing             = (*(c->super))->is_missing;
    c->pack_double            = (*(c->super))->pack_double;
    c->unpack_double          = (*(c->super))->unpack_double;
    c->pack_string            = (*(c->super))->pack_string;
    c->unpack_string          = (*(c->super))->unpack_string;
    c->pack_string_array      = (*(c->super))->pack_string_array;
    c->unpack_string_array    = (*(c->super))->unpack_string_array;
    c->pack_bytes             = (*(c->super))->pack_bytes;
    c->unpack_bytes           = (*(c->super))->unpack_bytes;
    c->pack_expression        = (*(c->super))->pack_expression;
    c->notify_change          = (*(c->super))->notify_change;
    c->update_size            = (*(c->super))->update_size;
    c->preferred_size         = (*(c->super))->preferred_size;
    c->resize                 = (*(c->super))->resize;
    c->nearest_smaller_value  = (*(c->super))->nearest_smaller_value;
    c->next                   = (*(c->super))->next;
    c->compare                = (*(c->super))->compare;
    c->unpack_double_element  = (*(c->super))->unpack_double_element;
    c->unpack_double_subarray = (*(c->super))->unpack_double_subarray;
    c->clear                  = (*(c->super))->clear;
    c->make_clone             = (*(c->super))->make_clone;
}

/* END_CLASS_IMP */

static void init(grib_accessor* a, const long l, grib_arguments* args)
{
    int n                                 = 0;
    grib_accessor_decimal_precision* self = (grib_accessor_decimal_precision*)a;

    self->bits_per_value       = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->decimal_scale_factor = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->changing_precision   = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);
    self->values               = grib_arguments_get_name(grib_handle_of_accessor(a), args, n++);

    a->flags |= GRIB_ACCESSOR_FLAG_FUNCTION;
    a->length = 0;
}

static int unpack_long(grib_accessor* a, long* val, size_t* len)
{
    int ret                               = 0;
    grib_accessor_decimal_precision* self = (grib_accessor_decimal_precision*)a;
    grib_handle* h                        = grib_handle_of_accessor(a);

    if ((ret = grib_get_long_internal(h, self->decimal_scale_factor, val)) != GRIB_SUCCESS)
        return ret;

    *len = 1;
    return ret;
}

static int pack_long(grib_accessor* a, const long* val, size_t* len)
{
    long bitsPerValue                     = 0;
    double* values                        = NULL;
    size_t size                           = 0;
    int ret                               = 0;
    grib_accessor_decimal_precision* self = (grib_accessor_decimal_precision*)a;
    grib_context* c                       = a->context;
    grib_handle* h                        = grib_handle_of_accessor(a);

    if (!self->values) {
        if ((ret = grib_set_long_internal(h, self->bits_per_value, 0)) != GRIB_SUCCESS)
            return ret;

        if ((ret = grib_set_long_internal(h, self->decimal_scale_factor, *val)) != GRIB_SUCCESS)
            return ret;

        if ((ret = grib_set_long_internal(h, self->changing_precision, 1)) != GRIB_SUCCESS) {
            grib_context_free(c, values);
            return ret;
        }

        return GRIB_SUCCESS;
    }

    if ((ret = grib_get_size(h, self->values, &size)) != GRIB_SUCCESS)
        return ret;

    values = (double*)grib_context_malloc(c, size * sizeof(double));
    if (!values)
        return GRIB_OUT_OF_MEMORY;

    if ((ret = grib_get_double_array_internal(h, self->values, values, &size)) != GRIB_SUCCESS) {
        grib_context_buffer_free(c, values);
        return ret;
    }

    if ((ret = grib_set_long_internal(h, self->decimal_scale_factor, *val)) != GRIB_SUCCESS) {
        grib_context_buffer_free(c, values);
        return ret;
    }

    if ((ret = grib_set_long_internal(h, self->bits_per_value, bitsPerValue)) != GRIB_SUCCESS) {
        grib_context_free(c, values);
        return ret;
    }

    if ((ret = grib_set_long_internal(h, self->changing_precision, 1)) != GRIB_SUCCESS) {
        grib_context_free(c, values);
        return ret;
    }

    if ((ret = grib_set_double_array_internal(h, self->values, values, size)) != GRIB_SUCCESS) {
        grib_context_buffer_free(c, values);
        return ret;
    }

    grib_context_free(c, values);

    return GRIB_SUCCESS;
}
